BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 11. N:o 17. 7 
to believe, that when the animal first time was labelled, some 
unvoluntary change must have taken place and that the origi- 
nal specimen of M. SARS never was in the hands of the danish 
authors. 
The following parallel will show how inpossible 
it is to conciliate the two descriptions: 
M. SARS. 
Aega ventrosa dignoscitur 
»Oculis permagnis fere contingenti- 
bus, attamen sejunctis» 
>»Segmentis thoracis tribus ultimis 
repente latioribus, quinto etiam prece- 
denti duplo longiore» ' 
>Laminis pedum spuriorum ulti- 
morum 2&Xqvalibus, apice acuminatis, 
interna externa paulo latiore, margine 
interiore arcuato, exteriore fere recto.» 
SCHIOEDTE et MEINERT. 
Aega ventrosa 
»Oculi minuti, producte ovati, sexta 
parte latitudinis capitis distantes» 
Segmenta pereii tria ultima non 
latiora, quvintum precedens tertia cir- 
citer parte longitudinis superans ”). 
>Pedes anales longiusculi; remus in- 
terior quam exterior vix longior, ac 
paulo latior, post attenuatus, in latere 
exteriore leviter sinuatus. 
When I first read the diagnose of M. SARS, it struck me 
at once that Aega ventrosa, M. SARS was, if not identical with, 
very closely allied to a new Aega described by me last year 
under the name Aegiochus Nordenskiöldii”). After a 
more attentive examination I am fully convinced that they 
are the nearest relatives among the Aegide, but ought to 
be distinguished as separate species. The most important 
characteristics for establishing a new species were, according 
to SARS (1. c. p. 155) the abruptly broader segments of the 
pereion and the unusual length of the fifth pereional segment, 
being twice as long as the fourth. "These characteristics, in my 
opinion, have generic value and therefor I will retain the ge- 
nus Aegiochus. None of all these characteristics on the other 
hand agree with the type of SCHIoEDTE and MEINERT, it must 
therefor be something quite different from Aega ventrosa and 
ought to have another name. Whenever it may be identical 
with the above described Aega Lovéni or not, I am yet 
unable to decide. They are no doubt closely allied. I give 
here a diagnose of Aega ventrosa. M. SARS. 
!) The cursivated quoatations are taken from examination of the drawings 
of SCHIOEDTE and MEINERT. 
2) >A new Isopod from the Swedisch arctic expedition of 1883>, in Bihb. 
till K. Vetensk.-Handl. Bd. 10. N:o 9, p. 5. Sthm. 1885. 
